Robotics;Notes has a fabulous cast of characters, I'm tossing up between Akiho and Frau.

 * [[http://roboticsnotes.tv/| Official anime website]]
 * [[http://roboticsnotes.tv/character/#chara_2| Akiho profile]]
 * [[http://roboticsnotes.tv/character/#chara_4| Frau profile]]

Yumi has also suggested Misaki-nee as a possibility.